Hello all, I have a 61 chevy stepside that has had a muncie 4 speed put in. I need to add gear oil but I'm afraid to pull the plug out of the tranny. It seems to me that if I pull the plug that all the oil in there will leak out. Is this the case. Also how much oil and what kind do I put in there once I do it. Please help I'm new to this world but want to learn how to due this myself. Thanks